Preparation method of chitosan/2-acrylamido-2-methylpropanesulfonic acid hydrogel
An acrylamide-based, methylpropanesulfonic acid technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve problems such as poor performance and harsh CS/AMPS conditions
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Embodiment 1
[0059]Add 0.5 g CS and 15 mL distilled water into a 100 mL three-neck flask, stir at 75°C for 0.5 h, then add 3 g AMPS and 0.04 g N,N'-methylenebisacrylamide (MBA), and continue stirring for 15 min. The solution turned milky white, and after stirring at 75 °C for 3 h, a white jelly-like gel was produced, and the product was then cooled to room temperature. Take out the product and cut it into fragments with a length of 2-5 mm with scissors, and make -SO with 1 mol / L NaOH 3 The neutralization degree of H reached 70%. Afterwards, the product was washed several times with distilled water to remove unreacted monomers, and then washed several times with ethanol, and dried in vacuum at 60 °C to constant weight to obtain CS / AMPS hydrogel. , through a 100-mesh sieve, the yield is about 62%.
[0060] The performance indicators are as follows:
[0061] Water absorption performance: 93.6 g / g;
[0062] Adsorption properties of cationic dyes: The adsorption capacity of CS / AMPS hydrogel ...
Embodiment 2
[0064] Add 0.5 g CS and 15 mL distilled water into a 100 mL three-necked flask, stir at 70°C for 0.5 h, then add 5 g AMPS and 0.065 g N,N'-methylenebisacrylamide (MBA), and continue stirring for 10 min. The solution turned milky white, and after stirring at 75 °C for 2 h, a white jelly-like gel was produced, and the product was then cooled to room temperature. Take out the product and cut it into fragments with a length of 2-5 mm with scissors, and make SO with 1mol / L NaOH 3 The neutralization degree of H reaches 80%. After that, the product is washed several times with distilled water to remove unreacted monomers, and then washed several times with ethanol. o C Vacuum dried to constant weight to obtain CS / AMPS hydrogel, crushed through a 100-mesh sieve, the yield was about 82%.
[0065] The performance indicators are as follows:
[0066] Water absorption performance: 222.8 g / g;
[0067] Adsorption properties of cationic dyes: The adsorption capacity of CS / AMPS hydrogel to ...
Embodiment 3
[0069] Add 0.5 g CS and 20 mL distilled water into a 100 mL three-neck flask, stir at 70 °C for 0.5 h, then add 7 g AMPS and 0.080 g N,N'-methylenebisacrylamide (MBA), and continue stirring for 10 min , the solution turned milky white, and after stirring at 75 °C for 3 h, a milky white jelly-like gel was produced, and then the product was cooled to room temperature. Take out the product and cut it into fragments with a length of 2~5 mm with scissors, and make -SO with 1mol / L NaOH 3 The neutralization degree of H reached 90%. After that, the product was washed several times with distilled water to remove unreacted monomers, then washed several times with ethanol, and dried in vacuum at 60°C to constant weight to obtain CS / AMPS hydrogel. Through a 100-mesh sieve, the yield is about 85%.
[0070] The performance indicators are as follows:
[0071] Water absorption performance: 175.5 g / g;
[0072] Adsorption properties of cationic dyes: The adsorption capacity of CS / AMPS hydrog...
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